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Well done! I only asked about 7. …..Ra6 because it was almost surely the main idea the composer of the problem had- white has to solve the problem with, first the maneuver 8.Bxa6 followed by the amazing 9.Bd3 which allows the blocking check with 10.Rg2. Then white must ensure the ending is winning by underpromoting with check the f-pawn before he takes the queen.

All in all, this is a hideously difficult problem as are many of Ryabinin’s compositions- the key to winning it is overloading the black rook/knight combo by constantly flanking them with the maneuvers Ra3-Rh3-Re3. Eventually, black is forced into Ng6 leaving too many holes on the back rank. Tomorrow, I will pick out another Ryabinin puzzle from the list of them that I have worked on in the past, but I will post some more, somewhat easier puzzles from Susan’s blog in the leading puzzle thread.

If you want what amounts to the full analysis of this problem- my comments from the previous posting of this puzzle are probably as exhaustive as it gets: Link.

You will have to scroll all the comments to find them since I also tried to make moves like 1.Rg2 and 1.Rg2 work, but they were draws at best for white. It was only later that I began to understand how 1.Ra3 was the right approach.

If you want what amounts to the full analysis of this problem- my comments from the previous posting of this puzzle are probably as exhaustive as it gets: Link.

You will have to scroll all the comments to find them since I also tried to make moves like 1.Rg2 and 1.Rg2 work, but they were draws at best for white. It was only later that I began to understand how 1.Ra3 was the right approach.